Electricity review

Plastic conducts very little thermal energy or electricity. Because of this property, plastic would most likely be used to cover

• metal
• wood
• solids
• liquids

Electric circuits provide energy for lightbulbs. Which of these prevents the flow of electrons?

• a circuit that is closed
• a series circuit
• a circuit that is closed
• a parallel circuit

Which of the following would make the best insulator against the flow of electricity?

• copper wire
• steel tubing
• plastic tape
• aluminum foil

There is a metal strip connected by wires to a battery and light bulb. Which property of the metal is being tested with this setup?

• luster
• density
• elasticity
• conductivity

Which would be the best conductor of electricity?

• air
• cork
• water
• silver

Which item is not a good conductor of electricity?

• a tin can
• a rubber tire
• a copper coin
• an aluminum wire

Which substance can be used to conduct electricity in a circuit?

• metal
• wood
• rubber
• plastic

Which of the following is least likely to allow electricity to flow?

• aluminum
• copper
• plastic
• water

In order for an object to create a magnetic field, what must flow through the wire coil?

• heat
• metal
• electricity
• light

What is an insulator?

• a device that keeps too much current from flowing through wires
• a switch that protects circuits from currents that are too high
• a material through which current cannot move easily
• a loop of wire that generates an alternating current